INCLUDED ITEMS HOW TO ORDER ELECTROCHEMICAL

INCLUDED ITEMS
»»
»»
Ozonesonde(s)
One-year warranty
HOW TO
ORDER
Contact DMT for pricing or more information:
+1.303.440.5576,
[email protected]
ELECTROCHEMICAL
CONCENTRATION CELL (ECC)
OZONESONDE
OVERVIEW
The DMT/EN-SCI ECC ozonesonde is a
lightweight, compact, and inexpensive balloonborne instrument for measuring atmospheric
ozone. Developed by Dr. Walter Komhyr and
sold for decades by EN-SCI Corporation, it is
now manufactured exclusively by DMT.
APPLICATIONS
»»
»»
Atmospheric research
Climate-change research
HOW IT
WORKS
Unlike some ozonesondes, ECC sondes do not
require an external electrical potential. The ECC
gets its driving electromotive force from the
difference in the concentration of the potassium
iodide solutions in the instrument’s cathode
and anode chambers. When ozone enters the
sensor, iodine is formed in the cathode half
cell. The cell then converts the iodine to iodide,
a process during which electrons flow in the
cell’s external circuit. By measuring the electron
flow (i.e., the cell current) and the rate at which
ozone enters the cell per unit time,
ozone concentrations can be
calculated.
ADVANTAGES
»»
Accurate, precise, high-resolution ozone
measurements
»» Unique design that allows pump operation
without ozone-destroying lubricants
»» Easily coupled with the most popular
radiosonde models for parameters such
as GPS coordinates, pressure/altitude,
temperature, and relative humidity
»» Portable and economical data system
(optional)
MODELS
ECC Ozonesondes are available in several
models to accommodate different radiosondes
and operating environments:
DATA ACQUISITION
SYSTEM
The Model DAS-2 Data Acquisition and
Processing System allows for data acquisition,
data processing, and post-processing analysis.
The DAS-2 system includes the following
components:
»»
»»
»»
Software
Modem
Tripod-mounted 403 MHz Yagi antenna with
preamplifier
»» 403 MHz receiver
»» 15-meter co-axial signal cable
The user supplies the personal computer the
DAS-2 system runs on.
»»
Model Z: fits Vaisala RS92 digital and
analog radiosondes
»» Model 2Z-V2D(E): fits older Vaisala
radiosondes
»» Model 2Z-V7: fits InterMet radiosondes
»» Model 4Z: designed for ground use
Photo: ECC Ozonesonde being launched in
Fairbanks, Alaska. Photo courtesy of NOAA/
ESRL Global Monitoring Division.
ACCESSORIES
»»
»»
»»
»»
Balloons
Ozonizer/test unit
Ozone-observation program start-up kit
Data acquisition system (DAS-2)
The ozonizer/test unit (above) is used for
conditioning ECC ozonesondes with ozone and
checking sonde performance of prior to flight.
The kit includes a HI ozone source, a NO-LO
ozone source, a 12 VDC sonde pump, power
meters, and an 18 VDC power source.
The start-up kit, pictured above, is designed for
preparing ECC ozonesondes for use. It includes
sensor chemicals for 200 flights, an airflow-rate
measurement apparatus, a pressure vacuum
gauge, and ozone destruction filters, as well as
syringes, beakers, and a scale.
ECC OZONESONDE
ECC OZONESONDE, CONT.
PERFORMANCE SPECIFICATIONS
SELECTED BIBLIOGRAPHY
Pressure Altitude (hPa)
Accuracy (%)
Precision (%)
Resolution* (km)
1000
±5
±4
0.3
200
± 12
±12
0.3
100
±5
±3
0.3
10
±5
±3
0.4
4
± 10
±10
0.4
* Corresponding to approximately a 90% step change in ozone in one minute.
GENERAL SPECIFICATIONS
Technique
Electrochemical process that generates electrical current in proportion
to ozone concentrations
Measured Parameters
Ozone partial pressure
Auxiliary Parameters
Sonde housekeeping parameters
Included Components
»»
»»
»»
Operating Pressure
1050-4 hPa
Operating Temperature
0 – 40 °C
Inside flight box ambient temperature to -90 °C
Power Requirements
12 – 18 VDC, 120 mA
Weight
»»
»»
Instrument Dimensions
7.6 cm x 7.9 cm x 13.3 cm
Flight Box Dimensions
19.1 cm x 19.1 cm x 25.4 cm
Pump battery (Lithium dry cell or water-activated)
Sampling tube
Styrofoam flight case
Komhyr, W.D., “Electrochemical Concentration Cells for Gas Analysis,” Ann. Geophys., 25: 203–
210, 1969.
Komhyr, W.D., J.A. Lathrop, D.P. Opperman, R.A. Barnes, and G.B. Brothers, “ECC Ozonesonde
Performance Evaluation during STOIC 1989,” J. Geophys. Res., 100(D5): 9231-9244, 1994.
Reid S.J., G. Vaughan, A.R. Marsh, and H.G.J. Smit (1996), “Intercomparison of Ozone
Measurements by ECC Sondes and BENDIX Chemiluminescent Analyser,” J. Atm. Chem., 25,
215-226.
Smit, H. G.J, W. Straeter, B. J. Johnson, S. J. Oltmans, J. Davies, D. W. Tarasick, B. Hoegger,
R. Stubi, F. J. Schmidlin, T. Northam, A. M. Thompson, J. Witte, I. Boyd, F. Posny (2007),
“Assessment of the Performance of ECC-ozonesondes under Quasi-flight Conditions in the
Environmental Simulation Chamber: Insights from the Jülich Ozone Sonde Intercomparison
Experiment (JOSIE),” J. Geophys. Res., 112, D19306, doi:10.1029/2006JD007308.
Stübi R., Levrat G., Hoegger B., Viatte P., Staehelin J., Schmidlin F. J.: 2008, “In-flight Comparison
of Brewer-Mast and Electrochemical Concentration Cell Ozonesondes,” J. Geophys. Res., 113,
D13302, doi:10.1029/2007JD009091.
Terao, Y., and J. A. Logan (2007), “Consistency of Time Series and Trends of Stratospheric
Ozone as seen by Ozonesonde, SAGE II, HALOE, and SBUV(/2),” J. Geophys. Res., 112,
doi:10.1029/2006JD007667.
480 g for instrument, including wet battery
240 g for polystyrene flight box
Specifications are subject to change without notice.
2545 Central Avenue
Boulder, Colorado, USA 80301
www.dropletmeasurement.com
ph: 303-440-5576, fax: 303-440-1965
Rev A -3 June 12, 2014